Abstract
The deformation and retraction of bulk poly(4-methylpentene-1) (P4MP1) in the swollen state was studied by electron microscope and wide angle X-ray diffraction. P4MP1 swollen with various swelling agents can be stretched several hundred percent at room temperature in a macroscopically uniform manner. On the microscopic level the deformation is quite heterogeneous. If allowed to relax, a certain fraction of the deformation is recovered instantaneously followed by further recovery with time. Repeated replica electron micrographs of the same area indicate that pulled-out fibrils take a major role in the retraction at high elongation and that interlamellar slip is predominant at low elongation. Use of a solid swelling agent permitted replication of the swollen polymer; swelling occurs by separation of lamellae revealing interlamellar links which retract upon deswelling.
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Hase, Y., Geil, P. Swelling, Deformation, and Retraction of Poly(4-methylpentene-1). I. Morphological Observations. Polym J 2, 560–580 (1971). https://doi.org/10.1295/polymj.2.560
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DOI: https://doi.org/10.1295/polymj.2.560
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